absolute majority additional member system approval voting australia borda count bucklin voting cpo-stv canada closed list coalition government condorcet criterion condorcet method constituency contingent vote cumulative voting deliberative democracy england exhaustive ballot highest averages method instant-runoff voting kemeny-young method largest remainder method legislature limited voting matrix vote minimax condorcet mixed member proportional representation open list parallel voting parliamentary system party-list proportional representation plurality-at-large voting plurality voting system preferential block voting preferential voting president of argentina president of austria president of brazil president of chile president of croatia president of cyprus president of finland president of guatemala president of indonesia president of portugal president of romania president of serbia president of sri lanka proportional representation queensland quota borda system random ballot range voting ranked pairs republic of ireland schulze stv schulze method single-winner voting system single non-transferable vote single transferable vote sortition spoiler effect strategic nomination tactical manipulation of runoff voting tactical voting tennessee united kingdom united states voter fatigue voter turnout voting system